Location of Repository

Multi-instrument observations of a large scale Pc4 pulsation

By L. B. N. Clausen, Tim K. Yeoman, R. Behlke and E. A. Lucek


On 7 November 2005 various ground based and spaced based instruments registered five wave packets with frequencies in the Pc4 range. The most prominent of the five wave packets was observed in ground based magnetometer data spanning almost all latitudes on the dayside magnetosphere. The propagation from the dayside into the tail is deduced from Poynting flux calculations of Cluster data and an onset time analysis of the ground based magnetometer data. This suggests an upstream source. Backstreaming ions are identified to be the most probable source mechanism for this event. Due to the fortunate configuration of the Cluster satellites, the harmonic structure of the wave is analysed and compared with cross-phase spectra from ground data. We present evidence that the driving wave resonantly interacted with geomagnetic field lines. The data suggests that resonant driving occurred at stations where the driving frequency was harmonically related to the local fundamental frequency, creating FLR-like signatures

Publisher: Copernicus Publications on behalf of the European Geosciences Union (EGU)
Year: 2008
DOI identifier: 10.5194/angeo-26-185-2008
OAI identifier: oai:lra.le.ac.uk:2381/8159

Suggested articles



  1. (1970). A theory of generation of bow-shock-associated hydromagnetic waves in the upstream interplanetary medium, doi
  2. (1974). A theory of long-period magnetic pulsations, 1. Steady state excitation of field line resonance, doi
  3. (1995). A.: Modeling the Earth’s magnetospheric magnetic field confined within a realistic magnetopause, doi
  4. (1997). An analytic approach to toroidal eigen mode, doi
  5. Clausen acknowledges funding from the European Commission under the Marie Curie Host Fellowship for Early Stage Research Training SPARTAN, Contract No MEST-CT2004-007512,
  6. (2007). Correlation between plasmapause position and solar wind parameters, doi
  7. (1984). Dependence of the spectrum of Pc 3-4 pulsations on the interplanetary magnetic field, doi
  8. (1996). Eigenfrequencies of geomagnetic field lines and implications for plasma-density modeling, doi
  9. (1987). Field line resonance effects in local meridional structure of midlatitude geomagnetic pulsations,
  10. Harmonic structure of Pc 3-4 pulsations, doi
  11. (1981). Instabilities of low frequency, parallel propagating electromagnetic waves in the earth’s foreshock region, doi
  12. (1972). Latitude-dependent characteristics of high-latitude Pc 4 and Pc 5 micropulsations, doi
  13. (2001). Magnetospheric electron density model inferred from Polar plasma wave data, doi
  14. (2004). Monitoring the plasmapause using geomagnetic field line resonances, doi
  15. (2002). Morning sector drift-bounce resonance driven ULF waves observed in artificially-induced HF radar backscatter, doi
  16. (1991). PC 3,4 magnetic pulsations observed simultaneously in the magnetosphere and at multiple ground stations, doi
  17. (1998). Phase skipping and Poynting flux of continuous pulsations, doi
  18. (2001). Propagation of the preliminary reverse impulse of sudden commencements to low latitudes, doi
  19. (1971). Relationship between Pc 2-4 pulsations and the interplanetary field,
  20. (1996). Solar wind control of upstream wave frequency, doi
  21. (1974). Some features of field line resonances in the magnetosphere, doi
  22. (2007). Spatial and temporal characteristics of poloidal waves in the terrestrial plasmasphere: a CLUSTER case study, doi
  23. (1979). STARE auroral radar observations of Pc 5 geomagnetic pulsations, doi
  24. (2001). The Cluster Magnetic Field Investigation: Overview of In-Flight Performance and Initial Results, doi
  25. (1999). the Day the Solar Wind Almost Disappeared, doi
  26. (1997). The Electric Field and Wave Experiment for the Cluster Mission, Space Sci. doi
  27. (1964). The Structure of Three-dimensional Hydromagnetic Waves in a Uniform Cold Plasma, doi
  28. (1995). The temporal variation of the frequency of high latitude field line resonances, doi
  29. (1998). ULF pulsations observed by the ETS-VI satellite: Substorm associated azimuthal doi

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.